When should I lower the cot base?
Short answer: Lower the base before your baby can sit, kneel or pull up, so they cannot climb or topple over the side. Check your cot's instructions.
Here is the detail behind that answer, taken from current UK guidance from the NHS and the Lullaby Trust.
Things to check
- Check the internal size and buy a mattress that fits with no gaps.
- Adjustable base heights let you lower the mattress as your baby learns to sit and stand.
- Teething rails protect the top rails from little teeth.
What the guidance says
- Keep the cot clear: no pillows, duvets, cot bumpers, loose blankets, soft toys, pods, nests, wedges or anything to keep your baby in place.
Related questions
What is a cot?
A framed baby bed with fixed sides, usually taking a 120 x 60cm mattress.
Shop at Baby Kingdom
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Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
Can a 9 month old still sleep in a bedside crib?Reflux and positioning quizWhat safety standard should a bedside crib meet?How do I set up a nursery in a small room?Your 4 month's sleep space: a safe-sleep guideYour 18 month's sleep space: a safe-sleep guideAll safe sleep and sleep spaces advice →
Sources
- NHS: Sudden infant death syndrome (SIDS) (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.